| Seq | Timestamp | Type | Name | Duration |
|---|---|---|---|---|
| 0/0 | 2026/08/07 19:24 | flow | patch-triage |
3mArgs:null Results: {
"EnableConfigs": [
"SUNRPC",
"NFS_FS",
"NFSD"
],
"FocusSymbols": [
"svc_register",
"svc_generic_rpcbind_set",
"rpcb_register",
"rpcb_v4_register",
"rpcb_create_local"
],
"KMSANReasoning": "The patch modifies timeout handling for local RPC bind calls in the sunrpc subsystem. It introduces a static constant `rpcb_local_timeout` structure, adds timeout-related flags (`RPC_TASK_SOFT | RPC_TASK_TIMEOUT`) to `rpcb_register_call`, and adds logic to propagate `-ETIMEDOUT` errors in `svc_generic_rpcbind_set` and `svc_register`. These changes do not introduce any new allocations, do not expose kernel memory to user space, and do not involve uninitialized variables. Any potential bugs introduced by these changes (such as use-after-free or race conditions due to timeouts) would be caught by standard KASAN or LOCKDEP. There is no risk of uninitialized memory usage or info-leaks that would require KMSAN.",
"NeedsKMSAN": false,
"Reasoning": "The patch introduces a timeout for local rpcbind calls and handles -ETIMEDOUT in svc_register and svc_generic_rpcbind_set. This is a functional change in the sunrpc subsystem that can be triggered by registering RPC services, which is reachable from userspace via NFS or other RPC mechanisms.",
"WorthFuzzing": true
} |
| 1/1 | 2026/08/07 19:24 | action | read-patch-diff |
0mArgs:null Results: {
"PatchDiff": "commit 59b6884cf519c0411a02d7f6d9a08f0d7e810688\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Fri Aug 7 19:23:59 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/net/sunrpc/rpcb_clnt.c b/net/sunrpc/rpcb_clnt.c\nindex 6aa372188c86a..4094f3257876d 100644\n--- a/net/sunrpc/rpcb_clnt.c\n+++ b/net/sunrpc/rpcb_clnt.c\n@@ -221,6 +221,12 @@ static void rpcb_set_local(struct net *net, struct rpc_clnt *clnt,\n # define SUN_LEN(ptr) (offsetof(struct sockaddr_un, sun_path)\t\t\\\n \t\t + 1 + strlen((ptr)-\u003esun_path + 1))\n \n+static const struct rpc_timeout rpcb_local_timeout = {\n+\t.to_initval = (HZ / 10) ? : 1,\n+\t.to_maxval = (HZ / 10) ? : 1,\n+\t.to_retries = 0,\n+};\n+\n /*\n * Returns zero on success, otherwise a negative errno value\n * is returned.\n@@ -238,6 +244,7 @@ static int rpcb_create_af_local(struct net *net,\n \t\t.version\t= RPCBVERS_2,\n \t\t.authflavor\t= RPC_AUTH_NULL,\n \t\t.cred\t\t= current_cred(),\n+\t\t.timeout\t= \u0026rpcb_local_timeout,\n \t\t/*\n \t\t * We turn off the idle timeout to prevent the kernel\n \t\t * from automatically disconnecting the socket.\n@@ -312,6 +319,7 @@ static int rpcb_create_local_net(struct net *net)\n \t\t.version\t= RPCBVERS_2,\n \t\t.authflavor\t= RPC_AUTH_UNIX,\n \t\t.cred\t\t= current_cred(),\n+\t\t.timeout\t= \u0026rpcb_local_timeout,\n \t\t.flags\t\t= RPC_CLNT_CREATE_NOPING,\n \t};\n \tstruct rpc_clnt *clnt, *clnt4;\n@@ -402,11 +410,11 @@ static struct rpc_clnt *rpcb_create(struct net *net, const char *nodename,\n \n static int rpcb_register_call(struct sunrpc_net *sn, struct rpc_clnt *clnt, struct rpc_message *msg, bool is_set)\n {\n-\tint flags = RPC_TASK_NOCONNECT;\n+\tint flags = RPC_TASK_NOCONNECT | RPC_TASK_SOFT | RPC_TASK_TIMEOUT;\n \tint error, result = 0;\n \n \tif (is_set || !sn-\u003erpcb_is_af_local)\n-\t\tflags = RPC_TASK_SOFTCONN;\n+\t\tflags |= RPC_TASK_SOFTCONN;\n \tmsg-\u003erpc_resp = \u0026result;\n \n \terror = rpc_call_sync(clnt, msg, flags);\ndiff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c\nindex ae9ec4bf34f72..539ddd06467df 100644\n--- a/net/sunrpc/svc.c\n+++ b/net/sunrpc/svc.c\n@@ -1207,6 +1207,9 @@ int svc_generic_rpcbind_set(struct net *net,\n \terror = svc_rpcbind_set_version(net, progp, version,\n \t\t\t\t\tfamily, proto, port);\n \n+\tif (error == -ETIMEDOUT)\n+\t\treturn error;\n+\n \treturn (vers-\u003evs_rpcb_optnl) ? 0 : error;\n }\n EXPORT_SYMBOL_GPL(svc_generic_rpcbind_set);\n@@ -1243,6 +1246,8 @@ int svc_register(const struct svc_serv *serv, struct net *net,\n \t\t\t\tprintk(KERN_WARNING \"svc: failed to register \"\n \t\t\t\t\t\"%sv%u RPC service (errno %d).\\n\",\n \t\t\t\t\tprogp-\u003epg_name, i, -error);\n+\t\t\t\tif (error == -ETIMEDOUT)\n+\t\t\t\t\treturn error;\n \t\t\t\tbreak;\n \t\t\t}\n \t\t}\n"
} |
| 2/1 | 2026/08/07 19:24 | agent | patch-evaluator |
3mModel:best-expensive Args: null Results: {
"EnableConfigs": [
"SUNRPC",
"NFS_FS",
"NFSD"
],
"FocusSymbols": [
"svc_register",
"svc_generic_rpcbind_set",
"rpcb_register",
"rpcb_v4_register",
"rpcb_create_local"
],
"Reasoning": "The patch introduces a timeout for local rpcbind calls and handles -ETIMEDOUT in svc_register and svc_generic_rpcbind_set. This is a functional change in the sunrpc subsystem that can be triggered by registering RPC services, which is reachable from userspace via NFS or other RPC mechanisms.",
"WorthFuzzing": true
}Instruction: You are an expert Linux kernel maintainer. Your job is to review a provided patch series and determine if it makes functional changes to the kernel that should be fuzzed. IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in your workspace. Do NOT rely on your internal knowledge of the kernel. You must actively use your code access tools to examine the actual source code and confirm any assumptions. Return WorthFuzzing=false if the patch only contains: - Modifications to Documentation/, Kconfig files, or code comments. - Purely decorative changes, such as logging (e.g., pr_err, printk) or tracepoints. - Changes to numeric constants or macros that do not functionally alter execution flow. - Code paths that are impossible to reach in virtualized environments like GCE or QEMU, even when utilizing software-emulated hardware (e.g., usb gadget, mac80211_hwsim). - Code in vendor-specific PCIe switch, SmartNIC, or GPU drivers (e.g., mlxsw, pds_core, qed, ionic, amdgpu) that require physical PCIe hardware cards not emulated in standard QEMU. - Driver .remove, .shutdown, or pci_unregister_driver teardown callbacks (e.g., igb_remove) that are executed only during PCI hot-unplug or sysfs driver unbind operations. If it modifies reachable core kernel logic, drivers, or architectures, use your code search tools to verify the code can be executed, then return WorthFuzzing=true. When returning WorthFuzzing=true, you MUST ALSO: 1. Extract any specific kernel functions that should be heavily fuzzed into FocusSymbols. Avoid listing generic hot-path functions to prevent skewed test distributions. Prefer non-static, non-inlined API entrypoint functions over internal static helper functions (which are inlined by the compiler and do not have distinct symbol addresses). 2. Identify any specific CONFIG_ options required to properly test this new/modified feature. Go and look into the Kconfig files and check for ifdefs around the code, do not make assumptions. Also check "depends on" lines in Kconfig to include any non-standard parent subsystem configs needed for Kbuild to compile the code statically into vmlinux. List them in the EnableConfigs output array, and DO NOT add a 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4"). Prefer calling several tools at the same time to save round-trips. Use set-results tool to provide results of the analysis. It must be called exactly once before the final reply. Ignore results of this tool. Prompt: For your convenience, here is the diff of the changes:
commit 59b6884cf519c0411a02d7f6d9a08f0d7e810688
Author: syz-cluster <triage@syzkaller.com>
Date: Fri Aug 7 19:23:59 2026 +0000
syz-cluster: applied patch under review
diff --git a/net/sunrpc/rpcb_clnt.c b/net/sunrpc/rpcb_clnt.c
index 6aa372188c86a..4094f3257876d 100644
--- a/net/sunrpc/rpcb_clnt.c
+++ b/net/sunrpc/rpcb_clnt.c
@@ -221,6 +221,12 @@ static void rpcb_set_local(struct net *net, struct rpc_clnt *clnt,
# define SUN_LEN(ptr) (offsetof(struct sockaddr_un, sun_path) \
+ 1 + strlen((ptr)->sun_path + 1))
+static const struct rpc_timeout rpcb_local_timeout = {
+ .to_initval = (HZ / 10) ? : 1,
+ .to_maxval = (HZ / 10) ? : 1,
+ .to_retries = 0,
+};
+
/*
* Returns zero on success, otherwise a negative errno value
* is returned.
@@ -238,6 +244,7 @@ static int rpcb_create_af_local(struct net *net,
.version = RPCBVERS_2,
.authflavor = RPC_AUTH_NULL,
.cred = current_cred(),
+ .timeout = &rpcb_local_timeout,
/*
* We turn off the idle timeout to prevent the kernel
* from automatically disconnecting the socket.
@@ -312,6 +319,7 @@ static int rpcb_create_local_net(struct net *net)
.version = RPCBVERS_2,
.authflavor = RPC_AUTH_UNIX,
.cred = current_cred(),
+ .timeout = &rpcb_local_timeout,
.flags = RPC_CLNT_CREATE_NOPING,
};
struct rpc_clnt *clnt, *clnt4;
@@ -402,11 +410,11 @@ static struct rpc_clnt *rpcb_create(struct net *net, const char *nodename,
static int rpcb_register_call(struct sunrpc_net *sn, struct rpc_clnt *clnt, struct rpc_message *msg, bool is_set)
{
- int flags = RPC_TASK_NOCONNECT;
+ int flags = RPC_TASK_NOCONNECT | RPC_TASK_SOFT | RPC_TASK_TIMEOUT;
int error, result = 0;
if (is_set || !sn->rpcb_is_af_local)
- flags = RPC_TASK_SOFTCONN;
+ flags |= RPC_TASK_SOFTCONN;
msg->rpc_resp = &result;
error = rpc_call_sync(clnt, msg, flags);
diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
index ae9ec4bf34f72..539ddd06467df 100644
--- a/net/sunrpc/svc.c
+++ b/net/sunrpc/svc.c
@@ -1207,6 +1207,9 @@ int svc_generic_rpcbind_set(struct net *net,
error = svc_rpcbind_set_version(net, progp, version,
family, proto, port);
+ if (error == -ETIMEDOUT)
+ return error;
+
return (vers->vs_rpcb_optnl) ? 0 : error;
}
EXPORT_SYMBOL_GPL(svc_generic_rpcbind_set);
@@ -1243,6 +1246,8 @@ int svc_register(const struct svc_serv *serv, struct net *net,
printk(KERN_WARNING "svc: failed to register "
"%sv%u RPC service (errno %d).\n",
progp->pg_name, i, -error);
+ if (error == -ETIMEDOUT)
+ return error;
break;
}
}
|
| 3/2 | 2026/08/07 19:24 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 2842 output: 23 thoughts: 280 Thoughts: **Fuzzing Feasibility: Investigating a sunrpc Patch** Okay, so I've got a patch here that's making changes to `net/sunrpc/rpcb_clnt.c` and `net/sunrpc/svc.c`. Specifically, it introduces a local timeout, `rpcb_local_timeout`, for RPC bind clients within `rpcb_create_af_local` and `rpcb_create_local_net`. Also, `rpcb_register_call` is being updated to use `RPC_TASK_SOFT | RPC_TASK_TIMEOUT` flags. I see `svc_generic_rpcbind_set` and `svc_register` are now checking for `-ETIMEDOUT` errors and returning them. My initial thought is to figure out if this is fuzzing-worthy. SunRPC, as I recall, is definitely a target that's exposed to userspace, think NFS and other RPC services. That makes it an interesting target. Let's see, the patch touches these functions: `rpcb_create_af_local`, `rpcb_create_local_net`, `rpcb_register_call`, `svc_generic_rpcbind_set`, and `svc_register`. Right, time to check the config options. Let's make sure `CONFIG_SUNRPC` is enabled. If it is, then I'll look into its Kconfig. |
| 4/2 | 2026/08/07 19:24 | tool | grepper |
0mArgs:{
"Expression": "config SUNRPC",
"PathPrefix": ""
}Results: {
"Output": "net/sunrpc/Kconfig-1-# SPDX-License-Identifier: GPL-2.0-only\nnet/sunrpc/Kconfig:2:config SUNRPC\nnet/sunrpc/Kconfig-3-\ttristate\n--\nnet/sunrpc/Kconfig-5-\nnet/sunrpc/Kconfig:6:config SUNRPC_GSS\nnet/sunrpc/Kconfig-7-\ttristate\n--\nnet/sunrpc/Kconfig-10-\nnet/sunrpc/Kconfig:11:config SUNRPC_BACKCHANNEL\nnet/sunrpc/Kconfig-12-\tbool\n--\nnet/sunrpc/Kconfig-14-\nnet/sunrpc/Kconfig:15:config SUNRPC_SWAP\nnet/sunrpc/Kconfig-16-\tbool\n--\nnet/sunrpc/Kconfig=19=config RPCSEC_GSS_KRB5\n--\nnet/sunrpc/Kconfig-35-\nnet/sunrpc/Kconfig:36:config SUNRPC_DEBUG\nnet/sunrpc/Kconfig-37-\tbool \"RPC: Enable dprintk debugging\"\n--\nnet/sunrpc/Kconfig-49-\nnet/sunrpc/Kconfig:50:config SUNRPC_DEBUG_TRACE\nnet/sunrpc/Kconfig-51-\tbool \"RPC: Send dfprintk() output to the trace buffer\"\n--\nnet/sunrpc/Kconfig-63-\nnet/sunrpc/Kconfig:64:config SUNRPC_XPRT_RDMA\nnet/sunrpc/Kconfig-65-\ttristate \"RPC-over-RDMA transport\"\n"
} |
| 5/2 | 2026/08/07 19:24 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 3849 output: 31 thoughts: 161 Thoughts: **Analyzing the SUNRPC Configuration** Okay, so the current configuration is clearly centered around SUNRPC. My initial instinct is to see if there are any other relevant configurations present, just to be sure. I'm noting that key functions like `svc_generic_rpcbind_set` and `svc_register` are explicitly exported. That immediately flags them as potential points of interest, almost certainly API entrypoints. On the other hand, functions like `rpcb_create_af_local`, `rpcb_create_local_net`, and `rpcb_register_call` are static, which I'll keep in mind but likely won't require as close attention. The question now is whether `svc_generic_rpcbind_set` and `svc_register` are the best focus symbols. And yes, after a quick evaluation, `svc_register` is definitely an API entrypoint. And `svc_generic_rpcbind_set` also looks like a solid API entrypoint too. Alright, the next logical step is to dive into `net/sunrpc/svc.c` to examine the implementations of `svc_register` and `svc_generic_rpcbind_set` in greater detail. I'm expecting to find the core registration and configuration logic there. |
| 6/2 | 2026/08/07 19:24 | tool | grepper |
0mArgs:{
"Expression": "svc_register",
"PathPrefix": "net/sunrpc/svc.c"
}Results: {
"Output": "net/sunrpc/svc.c=1102=static int __svc_rpcb_register6(struct net *net, const u32 program,\n--\nnet/sunrpc/svc.c-1145- */\nnet/sunrpc/svc.c:1146:static int __svc_register(struct net *net, const char *progname,\nnet/sunrpc/svc.c-1147-\t\t\t const u32 program, const u32 version,\n--\nnet/sunrpc/svc.c-1165-\nnet/sunrpc/svc.c:1166:\ttrace_svc_register(progname, version, family, protocol, port, error);\nnet/sunrpc/svc.c-1167-\treturn error;\n--\nnet/sunrpc/svc.c=1171=int svc_rpcbind_set_version(struct net *net,\n--\nnet/sunrpc/svc.c-1176-{\nnet/sunrpc/svc.c:1177:\treturn __svc_register(net, progp-\u003epg_name, progp-\u003epg_prog,\nnet/sunrpc/svc.c-1178-\t\t\t\tversion, family, proto, port);\n--\nnet/sunrpc/svc.c=1215=EXPORT_SYMBOL_GPL(svc_generic_rpcbind_set);\n--\nnet/sunrpc/svc.c-1217-/**\nnet/sunrpc/svc.c:1218: * svc_register - register an RPC service with the local portmapper\nnet/sunrpc/svc.c-1219- * @serv: svc_serv struct for the service to register\n--\nnet/sunrpc/svc.c-1226- */\nnet/sunrpc/svc.c:1227:int svc_register(const struct svc_serv *serv, struct net *net,\nnet/sunrpc/svc.c-1228-\t\t const int family, const unsigned short proto,\n"
} |
| 7/2 | 2026/08/07 19:24 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 4807 output: 40 thoughts: 75 Thoughts: Here's my summary, as I see it: **RPC Binding Function Examination** Okay, so I'm thinking about how the RPC binding process is handled. I see that `svc_register` is available, so that's obviously part of the server-side registration process. And `svc_generic_rpcbind_set` is also exported – that likely handles some generic binding configuration. Now, to dig deeper into the client-side interaction, I should probably be looking at `net/sunrpc/rpcb_clnt.c`. I need to review those functions in that file which will deal with registering with the local RPC bind service (`rpcb_create_af_local`, `rpcb_create_local_net`, and `rpcb_register_call`). That should give me the full picture on how the client goes about connecting to and registering with the rpcbind service. |
| 8/2 | 2026/08/07 19:24 | tool | grepper |
0mArgs:{
"Expression": "rpcb_create_af_local",
"PathPrefix": "net/sunrpc/rpcb_clnt.c"
}Results: {
"Output": "net/sunrpc/rpcb_clnt.c=224=static const struct rpc_timeout rpcb_local_timeout = {\n--\nnet/sunrpc/rpcb_clnt.c-233- */\nnet/sunrpc/rpcb_clnt.c:234:static int rpcb_create_af_local(struct net *net,\nnet/sunrpc/rpcb_clnt.c-235-\t\t\t\tconst struct sockaddr_un *addr)\n--\nnet/sunrpc/rpcb_clnt.c=281=static int rpcb_create_local_abstract(struct net *net)\n--\nnet/sunrpc/rpcb_clnt.c-287-\nnet/sunrpc/rpcb_clnt.c:288:\treturn rpcb_create_af_local(net, \u0026rpcb_localaddr_abstract);\nnet/sunrpc/rpcb_clnt.c-289-}\n--\nnet/sunrpc/rpcb_clnt.c=291=static int rpcb_create_local_unix(struct net *net)\n--\nnet/sunrpc/rpcb_clnt.c-297-\nnet/sunrpc/rpcb_clnt.c:298:\treturn rpcb_create_af_local(net, \u0026rpcb_localaddr_unix);\nnet/sunrpc/rpcb_clnt.c-299-}\n"
} |
| 9/2 | 2026/08/07 19:24 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 5472 output: 40 thoughts: 56 Thoughts: **Analyzing the Local RPC Binding Functions** Okay, so I'm digging into this RPC code and noticing something interesting. It looks like `rpcb_create_af_local`, `rpcb_create_local_net`, and `rpcb_register_call` are all declared as `static`. That immediately piques my interest. Static functions mean their scope is limited to the current compilation unit, so they're not intended for external use. I wonder why these particular functions are deemed internal. My next step is clear: I need to understand the relationship of these local functions. Let's see who is actually calling `rpcb_create_local_net`. It seems as though someone wants to keep a close rein on the logic that uses this function. |
| 10/2 | 2026/08/07 19:24 | tool | grepper |
0mArgs:{
"Expression": "rpcb_create_local_net",
"PathPrefix": "net/sunrpc/rpcb_clnt.c"
}Results: {
"Output": "net/sunrpc/rpcb_clnt.c=291=static int rpcb_create_local_unix(struct net *net)\n--\nnet/sunrpc/rpcb_clnt.c-304- */\nnet/sunrpc/rpcb_clnt.c:305:static int rpcb_create_local_net(struct net *net)\nnet/sunrpc/rpcb_clnt.c-306-{\n--\nnet/sunrpc/rpcb_clnt.c=353=int rpcb_create_local(struct net *net)\n--\nnet/sunrpc/rpcb_clnt.c-366-\t rpcb_create_local_unix(net) != 0)\nnet/sunrpc/rpcb_clnt.c:367:\t\tresult = rpcb_create_local_net(net);\nnet/sunrpc/rpcb_clnt.c-368-\n"
} |
| 11/2 | 2026/08/07 19:24 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 5971 output: 38 thoughts: 13 Thoughts: Okay, here's my interpretation of that thought process, tailored for an expert audience, and presented as if it were my own internal monologue: **Focusing in on `rpcb_create_local`** Right, so `rpcb_create_local`... that's the exported function we're talking about here. Immediately, the significance clicks in. This isn't just *a* function; it's the outward-facing entry point, the one that makes this functionality available to the world, or at least, the local system. That means the signature, the behavior, the internal dependencies – all of it must be meticulously considered because it's the public API. It is how other modules, or applications, are intended to make use of the RPC binder functionality. Thinking further about the function, I immediately consider potential errors that may occur in setting up the local RPC binder. It will require the appropriate permissions, network configuration, and it must successfully register services. |
| 12/2 | 2026/08/07 19:24 | tool | grepper |
0mArgs:{
"Expression": "rpcb_create_local",
"PathPrefix": "net/sunrpc/rpcb_clnt.c"
}Results: {
"Output": "net/sunrpc/rpcb_clnt.c=206=static void rpcb_set_local(struct net *net, struct rpc_clnt *clnt,\n--\nnet/sunrpc/rpcb_clnt.c-211-\nnet/sunrpc/rpcb_clnt.c:212:\t/* Protected by rpcb_create_local_mutex */\nnet/sunrpc/rpcb_clnt.c-213-\tsn-\u003erpcb_local_clnt = clnt;\n--\nnet/sunrpc/rpcb_clnt.c=234=static int rpcb_create_af_local(struct net *net,\n--\nnet/sunrpc/rpcb_clnt.c-280-\nnet/sunrpc/rpcb_clnt.c:281:static int rpcb_create_local_abstract(struct net *net)\nnet/sunrpc/rpcb_clnt.c-282-{\n--\nnet/sunrpc/rpcb_clnt.c-290-\nnet/sunrpc/rpcb_clnt.c:291:static int rpcb_create_local_unix(struct net *net)\nnet/sunrpc/rpcb_clnt.c-292-{\n--\nnet/sunrpc/rpcb_clnt.c-304- */\nnet/sunrpc/rpcb_clnt.c:305:static int rpcb_create_local_net(struct net *net)\nnet/sunrpc/rpcb_clnt.c-306-{\n--\nnet/sunrpc/rpcb_clnt.c-352- */\nnet/sunrpc/rpcb_clnt.c:353:int rpcb_create_local(struct net *net)\nnet/sunrpc/rpcb_clnt.c-354-{\nnet/sunrpc/rpcb_clnt.c:355:\tstatic DEFINE_MUTEX(rpcb_create_local_mutex);\nnet/sunrpc/rpcb_clnt.c-356-\tint result = 0;\n--\nnet/sunrpc/rpcb_clnt.c-360-\nnet/sunrpc/rpcb_clnt.c:361:\tmutex_lock(\u0026rpcb_create_local_mutex);\nnet/sunrpc/rpcb_clnt.c-362-\tif (rpcb_get_local(net))\n--\nnet/sunrpc/rpcb_clnt.c-364-\nnet/sunrpc/rpcb_clnt.c:365:\tif (rpcb_create_local_abstract(net) != 0 \u0026\u0026\nnet/sunrpc/rpcb_clnt.c:366:\t rpcb_create_local_unix(net) != 0)\nnet/sunrpc/rpcb_clnt.c:367:\t\tresult = rpcb_create_local_net(net);\nnet/sunrpc/rpcb_clnt.c-368-\nnet/sunrpc/rpcb_clnt.c-369-out:\nnet/sunrpc/rpcb_clnt.c:370:\tmutex_unlock(\u0026rpcb_create_local_mutex);\nnet/sunrpc/rpcb_clnt.c-371-\treturn result;\n"
} |
| 13/2 | 2026/08/07 19:24 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 7050 output: 38 thoughts: 44 Thoughts: Here's my thought process, as requested: **Investigating the `rpcb_create_local` Function's Scope** Okay, so `rpcb_create_local` isn't static, or at least it seems to be exposed somehow. That's the clue I needed. Now, if it's visible outside its immediate scope, the logical place to start digging is the client-side code, particularly where it might be *used* to register calls. The obvious place to investigate next is the `net/sunrpc/rpcb_clnt.c` file. I'll need to check if `rpcb_register_call` is defined there and, more importantly, how it interacts with the function I'm curious about. Understanding this relationship should give me a good handle on how this registration process works. I'm hoping `rpcb_register_call` provides a clear pathway. |
| 14/2 | 2026/08/07 19:24 | tool | grepper |
0mArgs:{
"Expression": "rpcb_register_call",
"PathPrefix": "net/sunrpc/rpcb_clnt.c"
}Results: {
"Output": "net/sunrpc/rpcb_clnt.c=374=static struct rpc_clnt *rpcb_create(struct net *net, const char *nodename,\n--\nnet/sunrpc/rpcb_clnt.c-410-\nnet/sunrpc/rpcb_clnt.c:411:static int rpcb_register_call(struct sunrpc_net *sn, struct rpc_clnt *clnt, struct rpc_message *msg, bool is_set)\nnet/sunrpc/rpcb_clnt.c-412-{\n--\nnet/sunrpc/rpcb_clnt.c=462=int rpcb_register(struct net *net, u32 prog, u32 vers, int prot, unsigned short port)\n--\nnet/sunrpc/rpcb_clnt.c-483-\nnet/sunrpc/rpcb_clnt.c:484:\treturn rpcb_register_call(sn, sn-\u003erpcb_local_clnt, \u0026msg, is_set);\nnet/sunrpc/rpcb_clnt.c-485-}\n--\nnet/sunrpc/rpcb_clnt.c=490=static int rpcb_register_inet4(struct sunrpc_net *sn,\n--\nnet/sunrpc/rpcb_clnt.c-507-\nnet/sunrpc/rpcb_clnt.c:508:\tresult = rpcb_register_call(sn, sn-\u003erpcb_local_clnt4, msg, is_set);\nnet/sunrpc/rpcb_clnt.c-509-\tkfree(map-\u003er_addr);\n--\nnet/sunrpc/rpcb_clnt.c=516=static int rpcb_register_inet6(struct sunrpc_net *sn,\n--\nnet/sunrpc/rpcb_clnt.c-533-\nnet/sunrpc/rpcb_clnt.c:534:\tresult = rpcb_register_call(sn, sn-\u003erpcb_local_clnt4, msg, is_set);\nnet/sunrpc/rpcb_clnt.c-535-\tkfree(map-\u003er_addr);\n--\nnet/sunrpc/rpcb_clnt.c=539=static int rpcb_unregister_all_protofamilies(struct sunrpc_net *sn,\n--\nnet/sunrpc/rpcb_clnt.c-548-\nnet/sunrpc/rpcb_clnt.c:549:\treturn rpcb_register_call(sn, sn-\u003erpcb_local_clnt4, msg, false);\nnet/sunrpc/rpcb_clnt.c-550-}\n"
} |
| 15/2 | 2026/08/07 19:24 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 8004 output: 36 thoughts: 31 Thoughts: Okay, here's my take on those thoughts, framed as an expert's internal monologue: **Investigating the Registration Process** Alright, so we're looking at registration, specifically the exported function `rpcb_register`. My immediate thought is, "Okay, that's the entry point we're concerned with." I need to understand how this function works, and how it interacts with the system. What are its dependencies? How does it handle errors? To get a clearer picture, I'm going to dig a little deeper. I'll need to understand how the registration process is tied together, and how it differs from a more static method of RPC use. I'll need to examine `rpcb_create_local` and see if they are related. My focus will be on the key pieces: * How is the registration info handled? * What is registered in the process? * What resources are allocated? I'll be looking for potential bottlenecks, security vulnerabilities, or performance optimizations in these functions. It's time to dive into the code! |
| 16/2 | 2026/08/07 19:25 | tool | grepper |
0mArgs:{
"Expression": "rpcb_register",
"PathPrefix": "net/sunrpc/rpcb_clnt.c"
}Results: {
"Output": "net/sunrpc/rpcb_clnt.c=374=static struct rpc_clnt *rpcb_create(struct net *net, const char *nodename,\n--\nnet/sunrpc/rpcb_clnt.c-410-\nnet/sunrpc/rpcb_clnt.c:411:static int rpcb_register_call(struct sunrpc_net *sn, struct rpc_clnt *clnt, struct rpc_message *msg, bool is_set)\nnet/sunrpc/rpcb_clnt.c-412-{\n--\nnet/sunrpc/rpcb_clnt.c-429-/**\nnet/sunrpc/rpcb_clnt.c:430: * rpcb_register - set or unset a port registration with the local rpcbind svc\nnet/sunrpc/rpcb_clnt.c-431- * @net: target network namespace\n--\nnet/sunrpc/rpcb_clnt.c-461- */\nnet/sunrpc/rpcb_clnt.c:462:int rpcb_register(struct net *net, u32 prog, u32 vers, int prot, unsigned short port)\nnet/sunrpc/rpcb_clnt.c-463-{\n--\nnet/sunrpc/rpcb_clnt.c-483-\nnet/sunrpc/rpcb_clnt.c:484:\treturn rpcb_register_call(sn, sn-\u003erpcb_local_clnt, \u0026msg, is_set);\nnet/sunrpc/rpcb_clnt.c-485-}\n--\nnet/sunrpc/rpcb_clnt.c-489- */\nnet/sunrpc/rpcb_clnt.c:490:static int rpcb_register_inet4(struct sunrpc_net *sn,\nnet/sunrpc/rpcb_clnt.c-491-\t\t\t const struct sockaddr *sap,\n--\nnet/sunrpc/rpcb_clnt.c-507-\nnet/sunrpc/rpcb_clnt.c:508:\tresult = rpcb_register_call(sn, sn-\u003erpcb_local_clnt4, msg, is_set);\nnet/sunrpc/rpcb_clnt.c-509-\tkfree(map-\u003er_addr);\n--\nnet/sunrpc/rpcb_clnt.c-515- */\nnet/sunrpc/rpcb_clnt.c:516:static int rpcb_register_inet6(struct sunrpc_net *sn,\nnet/sunrpc/rpcb_clnt.c-517-\t\t\t const struct sockaddr *sap,\n--\nnet/sunrpc/rpcb_clnt.c-533-\nnet/sunrpc/rpcb_clnt.c:534:\tresult = rpcb_register_call(sn, sn-\u003erpcb_local_clnt4, msg, is_set);\nnet/sunrpc/rpcb_clnt.c-535-\tkfree(map-\u003er_addr);\n--\nnet/sunrpc/rpcb_clnt.c=539=static int rpcb_unregister_all_protofamilies(struct sunrpc_net *sn,\n--\nnet/sunrpc/rpcb_clnt.c-548-\nnet/sunrpc/rpcb_clnt.c:549:\treturn rpcb_register_call(sn, sn-\u003erpcb_local_clnt4, msg, false);\nnet/sunrpc/rpcb_clnt.c-550-}\n--\nnet/sunrpc/rpcb_clnt.c=596=int rpcb_v4_register(struct net *net, const u32 program, const u32 version,\n--\nnet/sunrpc/rpcb_clnt.c-615-\nnet/sunrpc/rpcb_clnt.c:616:\ttrace_rpcb_register(map.r_prog, map.r_vers, map.r_addr, map.r_netid);\nnet/sunrpc/rpcb_clnt.c-617-\n--\nnet/sunrpc/rpcb_clnt.c-619-\tcase AF_INET:\nnet/sunrpc/rpcb_clnt.c:620:\t\treturn rpcb_register_inet4(sn, address, \u0026msg);\nnet/sunrpc/rpcb_clnt.c-621-\tcase AF_INET6:\nnet/sunrpc/rpcb_clnt.c:622:\t\treturn rpcb_register_inet6(sn, address, \u0026msg);\nnet/sunrpc/rpcb_clnt.c-623-\t}\n"
} |
| 17/2 | 2026/08/07 19:25 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 9470 output: 25 thoughts: 120 Thoughts: **Analyzing the SunRPC Subsystem Changes** Okay, so I'm looking at this patch and immediately, I see we're dealing with exported functions: `rpcb_register`, `rpcb_v4_register`, `svc_register`, and `svc_generic_rpcbind_set`. That's a clear indicator this is touching the core of the RPC binding process. The important change is the addition of a timeout to local rpcbind calls, and the handling of `-ETIMEDOUT` within `svc_register` and `svc_generic_rpcbind_set`. This is a functional change, not just a cosmetic one; it directly impacts how services register and interact with the rpcbind daemon. Given the potential for subtle timing-related issues with these kinds of changes, this is *absolutely* something that needs fuzzing. The config option tied to this is `SUNRPC`, so first I'll quickly check its dependencies to get a better understanding of the wider context. |
| 18/2 | 2026/08/07 19:25 | tool | grepper |
0mArgs:{
"Expression": "depends on.*SUNRPC",
"PathPrefix": ""
}Results: {
"Output": "Documentation/admin-guide/nfs/nfs-rdma.rst=35=use with NFS/RDMA.\n--\nDocumentation/admin-guide/nfs/nfs-rdma.rst-134- are turned on. The NFS/RDMA client and server are configured via the hidden\nDocumentation/admin-guide/nfs/nfs-rdma.rst:135: SUNRPC_XPRT_RDMA config option that depends on SUNRPC and INFINIBAND. The\nDocumentation/admin-guide/nfs/nfs-rdma.rst-136- value of SUNRPC_XPRT_RDMA will be:\n--\nfs/nfs/Kconfig=198=config NFS_DEBUG\nfs/nfs/Kconfig-199-\tbool\nfs/nfs/Kconfig:200:\tdepends on NFS_FS \u0026\u0026 SUNRPC_DEBUG\nfs/nfs/Kconfig-201-\tdefault y\n--\nlib/Kconfig.debug=2169=config FAIL_SUNRPC\nlib/Kconfig.debug-2170-\tbool \"Fault-injection capability for SunRPC\"\nlib/Kconfig.debug:2171:\tdepends on FAULT_INJECTION_DEBUG_FS \u0026\u0026 SUNRPC_DEBUG\nlib/Kconfig.debug-2172-\thelp\n--\nnet/Kconfig=94=config NET_HANDSHAKE\nnet/Kconfig-95-\tbool\nnet/Kconfig:96:\tdepends on SUNRPC || NVME_TARGET_TCP || NVME_TCP\nnet/Kconfig-97-\tdefault y\n--\nnet/sunrpc/Kconfig=11=config SUNRPC_BACKCHANNEL\nnet/sunrpc/Kconfig-12-\tbool\nnet/sunrpc/Kconfig:13:\tdepends on SUNRPC\nnet/sunrpc/Kconfig-14-\nnet/sunrpc/Kconfig=15=config SUNRPC_SWAP\nnet/sunrpc/Kconfig-16-\tbool\nnet/sunrpc/Kconfig:17:\tdepends on SUNRPC\nnet/sunrpc/Kconfig-18-\nnet/sunrpc/Kconfig=19=config RPCSEC_GSS_KRB5\nnet/sunrpc/Kconfig-20-\ttristate \"Secure RPC: Kerberos V mechanism\"\nnet/sunrpc/Kconfig:21:\tdepends on SUNRPC \u0026\u0026 CRYPTO\nnet/sunrpc/Kconfig-22-\tdefault y\n--\nnet/sunrpc/Kconfig=36=config SUNRPC_DEBUG\nnet/sunrpc/Kconfig-37-\tbool \"RPC: Enable dprintk debugging\"\nnet/sunrpc/Kconfig:38:\tdepends on SUNRPC \u0026\u0026 SYSCTL\nnet/sunrpc/Kconfig-39-\tselect DEBUG_FS\n--\nnet/sunrpc/Kconfig=50=config SUNRPC_DEBUG_TRACE\nnet/sunrpc/Kconfig-51-\tbool \"RPC: Send dfprintk() output to the trace buffer\"\nnet/sunrpc/Kconfig:52:\tdepends on SUNRPC_DEBUG \u0026\u0026 TRACING\nnet/sunrpc/Kconfig-53-\tdefault n\n--\nnet/sunrpc/Kconfig=64=config SUNRPC_XPRT_RDMA\nnet/sunrpc/Kconfig-65-\ttristate \"RPC-over-RDMA transport\"\nnet/sunrpc/Kconfig:66:\tdepends on SUNRPC \u0026\u0026 INFINIBAND \u0026\u0026 INFINIBAND_ADDR_TRANS\nnet/sunrpc/Kconfig-67-\tdefault SUNRPC \u0026\u0026 INFINIBAND\n"
} |
| 19/2 | 2026/08/07 19:25 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 10683 output: 30 thoughts: 43 Thoughts: Okay, here's my take on those thoughts, framed as my own: **Analyzing the SUNRPC Configuration Option** Right, so `SUNRPC`. It seems pretty straightforward on the surface – it's a tristate option and doesn't explicitly rely on any other configurations, but I need to make sure, let's just make sure. Best to err on the side of caution. Let me check the dependencies. Hmm, let me consult the `net/sunrpc/Kconfig` file. That's the definitive source. I need to get into the details of the dependencies before making any decisions. That's where I need to look. |
| 20/2 | 2026/08/07 19:25 | tool | grepper |
0mArgs:{
"Expression": "config SUNRPC",
"PathPrefix": "net/sunrpc/Kconfig"
}Results: {
"Output": "net/sunrpc/Kconfig-1-# SPDX-License-Identifier: GPL-2.0-only\nnet/sunrpc/Kconfig:2:config SUNRPC\nnet/sunrpc/Kconfig-3-\ttristate\n--\nnet/sunrpc/Kconfig-5-\nnet/sunrpc/Kconfig:6:config SUNRPC_GSS\nnet/sunrpc/Kconfig-7-\ttristate\n--\nnet/sunrpc/Kconfig-10-\nnet/sunrpc/Kconfig:11:config SUNRPC_BACKCHANNEL\nnet/sunrpc/Kconfig-12-\tbool\n--\nnet/sunrpc/Kconfig-14-\nnet/sunrpc/Kconfig:15:config SUNRPC_SWAP\nnet/sunrpc/Kconfig-16-\tbool\n--\nnet/sunrpc/Kconfig=19=config RPCSEC_GSS_KRB5\n--\nnet/sunrpc/Kconfig-35-\nnet/sunrpc/Kconfig:36:config SUNRPC_DEBUG\nnet/sunrpc/Kconfig-37-\tbool \"RPC: Enable dprintk debugging\"\n--\nnet/sunrpc/Kconfig-49-\nnet/sunrpc/Kconfig:50:config SUNRPC_DEBUG_TRACE\nnet/sunrpc/Kconfig-51-\tbool \"RPC: Send dfprintk() output to the trace buffer\"\n--\nnet/sunrpc/Kconfig-63-\nnet/sunrpc/Kconfig:64:config SUNRPC_XPRT_RDMA\nnet/sunrpc/Kconfig-65-\ttristate \"RPC-over-RDMA transport\"\n"
} |
| 21/2 | 2026/08/07 19:25 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 11293 output: 23 thoughts: 49 Thoughts: **Analyzing a Tristate Kernel Configuration Option** Okay, so I'm looking at this tristate option, and immediately my mind jumps to the lack of any obvious dependencies. That feels a bit odd, doesn't it? Most of the time, when I see a tristate option in the kernel config, it's tied to something else, a parent option that governs its selection, or perhaps another, similar function. But, hang on, how *is* this thing selected? That's the real question. My intuition immediately flags things like `NFS_FS` or `NFSD` as the usual suspects when `SUNRPC` is involved. My train of thought always tends toward the tried-and-true pathways that I'm familiar with. I know I can't rely on intuition alone, time to head straight to the source. The next thing I'm going to do is dive into `fs/nfs/Kconfig`. That's where I'll find the definitive answer. I'll scour that file for dependencies, menu entries, and any clues about how this option gets triggered. That Kconfig file is the ultimate authority in this case. |
| 22/2 | 2026/08/07 19:25 | tool | grepper |
0mArgs:{
"Expression": "select SUNRPC",
"PathPrefix": ""
}Results: {
"Output": "fs/Kconfig=382=config NFS_COMMON_LOCALIO_SUPPORT\n--\nfs/Kconfig-386-\tdefault m if NFSD=m \u0026\u0026 NFS_FS=m\nfs/Kconfig:387:\tselect SUNRPC\nfs/Kconfig-388-\n--\nfs/nfs/Kconfig=2=config NFS_FS\n--\nfs/nfs/Kconfig-6-\tselect LOCKD\nfs/nfs/Kconfig:7:\tselect SUNRPC\nfs/nfs/Kconfig-8-\tselect NFS_COMMON\n--\nfs/nfs/Kconfig=77=config NFS_V4\n--\nfs/nfs/Kconfig-80-\tselect KEYS\nfs/nfs/Kconfig:81:\tselect SUNRPC_BACKCHANNEL\nfs/nfs/Kconfig-82-\thelp\n--\nfs/nfs/Kconfig=92=config NFS_SWAP\n--\nfs/nfs/Kconfig-95-\tdepends on NFS_FS \u0026\u0026 SWAP\nfs/nfs/Kconfig:96:\tselect SUNRPC_SWAP\nfs/nfs/Kconfig-97-\thelp\n--\nfs/nfsd/Kconfig=2=config NFSD\n--\nfs/nfsd/Kconfig-11-\tselect LOCKD\nfs/nfsd/Kconfig:12:\tselect SUNRPC\nfs/nfsd/Kconfig-13-\tselect EXPORTFS\n--\nnet/sunrpc/Kconfig=19=config RPCSEC_GSS_KRB5\n--\nnet/sunrpc/Kconfig-22-\tdefault y\nnet/sunrpc/Kconfig:23:\tselect SUNRPC_GSS\nnet/sunrpc/Kconfig-24-\tselect CRYPTO_KRB5\n"
} |
| 23/2 | 2026/08/07 19:25 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 12054 output: 42 thoughts: 209 Thoughts: **My Configuration Decisions for NFS Support** Okay, so I'm looking at how NFS is configured, and it's clear that both `NFS_FS` and `NFSD` depend on `SUNRPC`. My initial thought was to include both `NFS_FS` and `NFSD` in the EnableConfigs, or perhaps just `SUNRPC`. After a bit more thought, I realize that if `SUNRPC` is a tristate, and it usually is, then enabling it directly should be sufficient. However, I want to be *absolutely* certain that `NFS_FS` and `NFSD` are compiled and reachable, as they're the core components here. Therefore, I'm going to explicitly add `SUNRPC`, `NFS_FS`, and `NFSD` to the configurations. That should provide the most robust and explicit dependency handling. Now, regarding the focus symbols for verification, I need to make sure these key functions are available for inspection: `svc_register`, `svc_generic_rpcbind_set`, `rpcb_register`, `rpcb_v4_register`, and `rpcb_create_local`. Just to be completely thorough, I'll quickly double-check that `rpcb_create_local` is exported to ensure it is accessible. |
| 24/2 | 2026/08/07 19:25 | tool | grepper |
0mError:no matches Args: {
"Expression": "EXPORT_SYMBOL.*rpcb_create_local",
"PathPrefix": "net/sunrpc/rpcb_clnt.c"
}Results: {
"error": "no matches"
} |
| 25/2 | 2026/08/07 19:25 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 12596 output: 40 thoughts: 28 Thoughts: Okay, here's my take on those thoughts, framed as an expert's inner monologue: **Investigating the Data's Accessibility** Alright, so the data isn't *explicitly* exported, meaning it's not being presented directly as a standard, readily available data stream. But, and this is crucial, it also isn't "static". That means it's likely being generated or updated dynamically, and therefore *accessible* in some fashion, even if indirectly. The next logical step is to pinpoint *how* that accessibility is achieved. Let's delve in. My immediate thought is to check the `rpcb_register` function. If that's exported, it's a strong indicator that this process is participating in a remote procedure call and that could be a significant clue to how this works, which will ultimately guide me to the ultimate source of truth. |
| 26/2 | 2026/08/07 19:25 | tool | grepper |
0mError:no matches Args: {
"Expression": "EXPORT_SYMBOL.*rpcb_register",
"PathPrefix": "net/sunrpc/rpcb_clnt.c"
}Results: {
"error": "no matches"
} |
| 27/2 | 2026/08/07 19:25 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 12863 output: 35 thoughts: 32 Thoughts: Here's my thought process, as if I were analyzing that code: **Finding the Exported Symbols** Okay, so I need to find out why these aren't showing up as exported. My first instinct is to check where these symbols are defined, and specifically, how they are made available to other parts of the kernel. Since these are likely RPC-related, `net/sunrpc/rpcb_clnt.c` is the logical place to start looking, given that's where the client-side RPC code resides. My specific focus? I'm going to scan that file for the `EXPORT_SYMBOL` macro. That's the crucial keyword, the signal to the linker that these symbols are meant to be available externally. If they're not there, I know I've found my problem and can adjust as required. |
| 28/2 | 2026/08/07 19:25 | tool | grepper |
0mArgs:{
"Expression": "EXPORT_SYMBOL",
"PathPrefix": "net/sunrpc/rpcb_clnt.c"
}Results: {
"Output": "net/sunrpc/rpcb_clnt.c=677=void rpcb_getport_async(struct rpc_task *task)\n--\nnet/sunrpc/rpcb_clnt.c-797-}\nnet/sunrpc/rpcb_clnt.c:798:EXPORT_SYMBOL_GPL(rpcb_getport_async);\nnet/sunrpc/rpcb_clnt.c-799-\n"
} |
| 29/2 | 2026/08/07 19:25 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 13226 output: 35 thoughts: 85 Thoughts: **Examining the RPC Bindings** Okay, so the initial focus is on this `rpcb_getport_async` function – that's the only one explicitly exported, which is interesting. But hold on, I'm seeing that `svc_register` and `svc_generic_rpcbind_set` are also available. That's unexpected. Wait a second... I recall `rpcb_register` being used within the `sunrpc` module itself. I need to get a clearer picture of how these pieces fit together. My next step is definitely to dive into `net/sunrpc/svc.c`. I need to understand the relationship between `svc_register`, `svc_generic_rpcbind_set`, and `rpcb_register`. It seems like those three might be used somehow in conjunction to register, and set the bindings in a generic manner. I need to understand what's going on behind the scenes with this RPC binding process. |
| 30/2 | 2026/08/07 19:25 | tool | grepper |
0mError:no matches Args: {
"Expression": "EXPORT_SYMBOL.*svc_register",
"PathPrefix": "net/sunrpc/svc.c"
}Results: {
"error": "no matches"
} |
| 31/2 | 2026/08/07 19:25 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 13562 output: 40 thoughts: 26 Thoughts: Here's my thought process, summarized as you requested: **A Kernel Module Flagged for Review** Okay, hold on a second... I'm reviewing this code diff and that `EXPORT_SYMBOL_GPL(svc_generic_rpcbind_set);` caught my eye immediately. Now, that's not something you see just anywhere. The `EXPORT_SYMBOL_GPL` macro is specifically for exporting symbols that are licensed under the GPL, meaning this function, `svc_generic_rpcbind_set`, is likely intended for use by GPL-licensed kernel modules. It's a key piece of the RPC binding functionality, making me think it’s part of a core network service. So this change must be related to some significant RPC update. I need to dig into how this function is used and why it needs to be made available. I also need to make sure the licensing is appropriate and that its inclusion doesn't introduce any compatibility issues with existing modules. Time to dive deeper and see what the whole change is about! |
| 32/2 | 2026/08/07 19:25 | tool | grepper |
0mArgs:{
"Expression": "EXPORT_SYMBOL.*svc_generic_rpcbind_set",
"PathPrefix": "net/sunrpc/svc.c"
}Results: {
"Output": "net/sunrpc/svc.c=1182=int svc_generic_rpcbind_set(struct net *net,\n--\nnet/sunrpc/svc.c-1214-}\nnet/sunrpc/svc.c:1215:EXPORT_SYMBOL_GPL(svc_generic_rpcbind_set);\nnet/sunrpc/svc.c-1216-\n"
} |
| 33/2 | 2026/08/07 19:25 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 13950 output: 31 thoughts: 20 Thoughts: Here's my take on the thought process, as if it were my own: **Investigating `EXPORT_SYMBOL` in `net/sunrpc/svc.c`** Okay, I'm thinking I need to refresh my memory on where exactly `EXPORT_SYMBOL` is used within the SunRPC service code. I specifically want to revisit `net/sunrpc/svc.c`. It's a key file, so it's a good starting point to understand the broader implications and context. I suspect there's a reason I'm focusing here, and it's probably related to symbol visibility or external module interactions. I'll need to remember the kernel's module loading mechanism and how `EXPORT_SYMBOL` plays a role in making functions or variables accessible outside the module in which they're defined. Time to go digging through the source code! |
| 34/2 | 2026/08/07 19:26 | tool | grepper |
0mArgs:{
"Expression": "EXPORT_SYMBOL",
"PathPrefix": "net/sunrpc/svc.c"
}Results: {
"Output": "net/sunrpc/svc.c=114=int sunrpc_set_pool_mode(const char *val)\n--\nnet/sunrpc/svc.c-117-}\nnet/sunrpc/svc.c:118:EXPORT_SYMBOL(sunrpc_set_pool_mode);\nnet/sunrpc/svc.c-119-\n--\nnet/sunrpc/svc.c=130=sunrpc_get_pool_mode(char *buf, size_t size)\n--\nnet/sunrpc/svc.c-147-}\nnet/sunrpc/svc.c:148:EXPORT_SYMBOL(sunrpc_get_pool_mode);\nnet/sunrpc/svc.c-149-\n--\nnet/sunrpc/svc.c=458=int svc_bind(struct svc_serv *serv, struct net *net)\n--\nnet/sunrpc/svc.c-463-}\nnet/sunrpc/svc.c:464:EXPORT_SYMBOL_GPL(svc_bind);\nnet/sunrpc/svc.c-465-\n--\nnet/sunrpc/svc.c=559=struct svc_serv *svc_create(struct svc_program *prog, unsigned int bufsize,\n--\nnet/sunrpc/svc.c-563-}\nnet/sunrpc/svc.c:564:EXPORT_SYMBOL_GPL(svc_create);\nnet/sunrpc/svc.c-565-\n--\nnet/sunrpc/svc.c=576=struct svc_serv *svc_create_pooled(struct svc_program *prog,\n--\nnet/sunrpc/svc.c-593-}\nnet/sunrpc/svc.c:594:EXPORT_SYMBOL_GPL(svc_create_pooled);\nnet/sunrpc/svc.c-595-\n--\nnet/sunrpc/svc.c=601=svc_destroy(struct svc_serv **servp)\n--\nnet/sunrpc/svc.c-633-}\nnet/sunrpc/svc.c:634:EXPORT_SYMBOL_GPL(svc_destroy);\nnet/sunrpc/svc.c-635-\n--\nnet/sunrpc/svc.c=761=void svc_pool_wake_idle_thread(struct svc_pool *pool)\n--\nnet/sunrpc/svc.c-783-}\nnet/sunrpc/svc.c:784:EXPORT_SYMBOL_GPL(svc_pool_wake_idle_thread);\nnet/sunrpc/svc.c-785-\n--\nnet/sunrpc/svc.c=796=int svc_new_thread(struct svc_serv *serv, struct svc_pool *pool)\n--\nnet/sunrpc/svc.c-829-}\nnet/sunrpc/svc.c:830:EXPORT_SYMBOL_GPL(svc_new_thread);\nnet/sunrpc/svc.c-831-\n--\nnet/sunrpc/svc.c=876=svc_set_pool_threads(struct svc_serv *serv, struct svc_pool *pool,\n--\nnet/sunrpc/svc.c-912-}\nnet/sunrpc/svc.c:913:EXPORT_SYMBOL_GPL(svc_set_pool_threads);\nnet/sunrpc/svc.c-914-\n--\nnet/sunrpc/svc.c=933=svc_set_num_threads(struct svc_serv *serv, unsigned int min_threads,\n--\nnet/sunrpc/svc.c-954-}\nnet/sunrpc/svc.c:955:EXPORT_SYMBOL_GPL(svc_set_num_threads);\nnet/sunrpc/svc.c-956-\n--\nnet/sunrpc/svc.c=969=bool svc_rqst_replace_page(struct svc_rqst *rqstp, struct page *page)\n--\nnet/sunrpc/svc.c-985-}\nnet/sunrpc/svc.c:986:EXPORT_SYMBOL_GPL(svc_rqst_replace_page);\nnet/sunrpc/svc.c-987-\n--\nnet/sunrpc/svc.c=1027=svc_exit_thread(struct svc_rqst *rqstp)\n--\nnet/sunrpc/svc.c-1041-}\nnet/sunrpc/svc.c:1042:EXPORT_SYMBOL_GPL(svc_exit_thread);\nnet/sunrpc/svc.c-1043-\n--\nnet/sunrpc/svc.c=1182=int svc_generic_rpcbind_set(struct net *net,\n--\nnet/sunrpc/svc.c-1214-}\nnet/sunrpc/svc.c:1215:EXPORT_SYMBOL_GPL(svc_generic_rpcbind_set);\nnet/sunrpc/svc.c-1216-\n--\nnet/sunrpc/svc.c=1344=svc_generic_init_request(struct svc_rqst *rqstp,\n--\nnet/sunrpc/svc.c-1391-}\nnet/sunrpc/svc.c:1392:EXPORT_SYMBOL_GPL(svc_generic_init_request);\nnet/sunrpc/svc.c-1393-\n--\nnet/sunrpc/svc.c=1761=u32 svc_max_payload(const struct svc_rqst *rqstp)\n--\nnet/sunrpc/svc.c-1768-}\nnet/sunrpc/svc.c:1769:EXPORT_SYMBOL_GPL(svc_max_payload);\nnet/sunrpc/svc.c-1770-\n--\nnet/sunrpc/svc.c=1795=int svc_encode_result_payload(struct svc_rqst *rqstp, unsigned int offset,\n--\nnet/sunrpc/svc.c-1800-}\nnet/sunrpc/svc.c:1801:EXPORT_SYMBOL_GPL(svc_encode_result_payload);\nnet/sunrpc/svc.c-1802-\n--\nnet/sunrpc/svc.c=1814=char *svc_fill_symlink_pathname(struct svc_rqst *rqstp, struct kvec *first,\n--\nnet/sunrpc/svc.c-1850-}\nnet/sunrpc/svc.c:1851:EXPORT_SYMBOL_GPL(svc_fill_symlink_pathname);\n"
} |
| 35/2 | 2026/08/07 19:26 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 15779 output: 31 thoughts: 31 Thoughts: Here's a summary of my thought process, as requested: **Debugging a Missing Export** Okay, so I'm encountering a problem – `svc_register` isn't showing up as exported. That's a bit odd. My first instinct, given its likely connection to network services, is to double-check the `net/sunrpc` subsystem. Specifically, I'll drill down to `net/sunrpc/svc.c`. That file is the most logical place to begin my investigation for the definition and export of `svc_register`. Let's see what's actually in there. |
| 36/2 | 2026/08/07 19:26 | tool | grepper |
0mArgs:{
"Expression": "svc_register",
"PathPrefix": "net/sunrpc/svc.c"
}Results: {
"Output": "net/sunrpc/svc.c=1102=static int __svc_rpcb_register6(struct net *net, const u32 program,\n--\nnet/sunrpc/svc.c-1145- */\nnet/sunrpc/svc.c:1146:static int __svc_register(struct net *net, const char *progname,\nnet/sunrpc/svc.c-1147-\t\t\t const u32 program, const u32 version,\n--\nnet/sunrpc/svc.c-1165-\nnet/sunrpc/svc.c:1166:\ttrace_svc_register(progname, version, family, protocol, port, error);\nnet/sunrpc/svc.c-1167-\treturn error;\n--\nnet/sunrpc/svc.c=1171=int svc_rpcbind_set_version(struct net *net,\n--\nnet/sunrpc/svc.c-1176-{\nnet/sunrpc/svc.c:1177:\treturn __svc_register(net, progp-\u003epg_name, progp-\u003epg_prog,\nnet/sunrpc/svc.c-1178-\t\t\t\tversion, family, proto, port);\n--\nnet/sunrpc/svc.c=1215=EXPORT_SYMBOL_GPL(svc_generic_rpcbind_set);\n--\nnet/sunrpc/svc.c-1217-/**\nnet/sunrpc/svc.c:1218: * svc_register - register an RPC service with the local portmapper\nnet/sunrpc/svc.c-1219- * @serv: svc_serv struct for the service to register\n--\nnet/sunrpc/svc.c-1226- */\nnet/sunrpc/svc.c:1227:int svc_register(const struct svc_serv *serv, struct net *net,\nnet/sunrpc/svc.c-1228-\t\t const int family, const unsigned short proto,\n"
} |
| 37/2 | 2026/08/07 19:26 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 16465 output: 35 thoughts: 26 Thoughts: Here's my thought process, as if I were considering this myself: **Investigating `svc_register` in `net/sunrpc/svc.c`** Okay, I need to verify something related to the `svc_register` function, likely within the context of RPC services. My initial thought is to navigate to the `net/sunrpc/svc.c` file within the kernel source. I need to make sure this function is exported, which means it's intended to be accessible outside of the immediate module or file. I'll need to check the function definition in `svc.c` to confirm it's declared with `EXPORT_SYMBOL` or a similar mechanism, making it visible to other parts of the kernel. This is a preliminary check before investigating further, depending on the context of the issue. |
| 38/2 | 2026/08/07 19:26 | tool | grepper |
0mError:no matches Args: {
"Expression": "EXPORT_SYMBOL.*svc_register",
"PathPrefix": "net/sunrpc/svc.c"
}Results: {
"error": "no matches"
} |
| 39/2 | 2026/08/07 19:26 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 16713 output: 33 thoughts: 75 Thoughts: Okay, let's see, I need to figure out how `svc_register` is being handled. Hold on a second, I thought I had already grepped for `EXPORT_SYMBOL` in `net/sunrpc/svc.c` specifically, and it didn't turn up any results. That's odd. So, it's either defined and exported somewhere *else* in the project, or maybe it's not actually exported at all. Time to shift gears. Let's not make any assumptions. I'll take the direct approach. I'll immediately check `include/linux/sunrpc/svc.h` for the declaration of `svc_register`. That header is the obvious place to find the public interface, if it exists, so that's the place to start. Let's see what's in there... |
| 40/2 | 2026/08/07 19:26 | tool | grepper |
0mArgs:{
"Expression": "svc_register",
"PathPrefix": "include/linux/sunrpc/svc.h"
}Results: {
"Output": "include/linux/sunrpc/svc.h=474=void\t\t svc_process_bc(struct rpc_rqst *req, struct svc_rqst *rqstp);\ninclude/linux/sunrpc/svc.h:475:int\t\t svc_register(const struct svc_serv *, struct net *, const int,\ninclude/linux/sunrpc/svc.h-476-\t\t\t\tconst unsigned short, const unsigned short);\n"
} |
| 41/2 | 2026/08/07 19:26 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 17115 output: 31 thoughts: 100 Thoughts: **Investigating RPC Registration in the Linux Kernel** Okay, so I'm diving into RPC registration within the kernel. My starting point is the declaration of the function I'm interested in, which is clearly defined in `include/linux/sunrpc/svc.h`. The fact that it's in a header file implies that this isn't a static function, which changes how I approach the analysis. My initial focus will be the registration functions and their associated calls. Therefore, the key symbols I need to examine are `svc_register`, `svc_generic_rpcbind_set`, `rpcb_register`, `rpcb_v4_register` and `rpcb_create_local`. The first four suggest that there is a range of register calls, and the final symbol might be the creation of something used locally. Now, I'll quickly verify the location of one of these key functions to assess how far I've come. I'll check whether `rpcb_register` is defined within the `include/linux/sunrpc/` directory. That'll give me a clearer picture of the code's structure and relationships. |
| 42/2 | 2026/08/07 19:26 | tool | grepper |
0mArgs:{
"Expression": "rpcb_register",
"PathPrefix": "include/linux/sunrpc/"
}Results: {
"Output": "include/linux/sunrpc/clnt.h=201=void\t\trpcb_put_local(struct net *);\ninclude/linux/sunrpc/clnt.h:202:int\t\trpcb_register(struct net *, u32, u32, int, unsigned short);\ninclude/linux/sunrpc/clnt.h-203-int\t\trpcb_v4_register(struct net *net, const u32 program,\n"
} |
| 43/2 | 2026/08/07 19:26 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 17609 output: 33 thoughts: 50 Thoughts: Okay, let's see... the code I'm looking for is definitely in `include/linux/sunrpc/clnt.h`. That makes sense; client-side RPC stuff is usually organized there. And since they are non-static functions, that tells me these functions are likely intended to be used externally, and not limited to that specific source file, which would be important for me to understand in my work. Now, let's check `rpcb_create_local` in the sunrpc include, I need to understand that piece better. |
| 44/2 | 2026/08/07 19:26 | tool | grepper |
0mArgs:{
"Expression": "rpcb_create_local",
"PathPrefix": "include/linux/sunrpc/"
}Results: {
"Output": "include/linux/sunrpc/clnt.h=197=struct rpc_xprt\t*rpc_task_get_xprt(struct rpc_clnt *clnt,\n--\ninclude/linux/sunrpc/clnt.h-199-\ninclude/linux/sunrpc/clnt.h:200:int\t\trpcb_create_local(struct net *);\ninclude/linux/sunrpc/clnt.h-201-void\t\trpcb_put_local(struct net *);\n"
} |
| 45/2 | 2026/08/07 19:26 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 17943 output: 153 thoughts: 418 Thoughts: **Analyzing the RPC Timeout Patch** Okay, so I've confirmed the patch is present. My immediate thought is to zero in on the relevant symbols and configuration options. From what I see, the primary focus is on these symbols: `svc_register`, `svc_generic_rpcbind_set`, `rpcb_register`, `rpcb_v4_register`, and `rpcb_create_local`. Those are the entry points, so to speak. Now, regarding the config options, it seems we're dealing with `SUNRPC`, `NFS_FS`, and `NFSD`. My instinct is to determine if we absolutely *need* both `NFS_FS` and `NFSD`, or if just enabling `SUNRPC` will suffice for compiling the necessary modules. I know `SUNRPC` alone is enough to bring in the `net/sunrpc/` code. However, to *trigger* the new functionality, which I understand is a timeout for local `rpcbind` calls, we'll probably need either `NFS_FS` or `NFSD` to actually create those RPC services. So, just to be sure, I will include both `NFS_FS` and `NFSD`. Let's do a quick sweep for any other relevant config options. Hmm, `SUNRPC_DEBUG` might be helpful for debugging later, but it's not essential for just triggering the functional change itself. Okay, back to the patch. It's adding a timeout to the local `rpcbind` client, and handling `-ETIMEDOUT` errors in `svc_register` and `svc_generic_rpcbind_set`. This is a *functional change* within the `sunrpc` subsystem. Critically, registering an RPC service will trigger it. And that's reachable from userspace through NFS or other RPC mechanisms. I am certain that this is a patch we will want to test aggressively using fuzzing. My analysis aligns with the JSON output: the patch is indeed worth fuzzing. The key symbols, required configurations, and the core reasoning are all well-documented and provide confidence in this assessment. |
| 46/2 | 2026/08/07 19:27 | tool | set-results |
0mArgs:{
"EnableConfigs": [
"SUNRPC",
"NFS_FS",
"NFSD"
],
"FocusSymbols": [
"svc_register",
"svc_generic_rpcbind_set",
"rpcb_register",
"rpcb_v4_register",
"rpcb_create_local"
],
"Reasoning": "The patch introduces a timeout for local rpcbind calls and handles -ETIMEDOUT in svc_register and svc_generic_rpcbind_set. This is a functional change in the sunrpc subsystem that can be triggered by registering RPC services, which is reachable from userspace via NFS or other RPC mechanisms.",
"WorthFuzzing": true
}Results: {
"EnableConfigs": [
"SUNRPC",
"NFS_FS",
"NFSD"
],
"FocusSymbols": [
"svc_register",
"svc_generic_rpcbind_set",
"rpcb_register",
"rpcb_v4_register",
"rpcb_create_local"
],
"Reasoning": "The patch introduces a timeout for local rpcbind calls and handles -ETIMEDOUT in svc_register and svc_generic_rpcbind_set. This is a functional change in the sunrpc subsystem that can be triggered by registering RPC services, which is reachable from userspace via NFS or other RPC mechanisms.",
"WorthFuzzing": true
} |
| 47/1 | 2026/08/07 19:27 | action | If |
0mArgs:{
"WorthFuzzing": true
}Results: null |
| 48/2 | 2026/08/07 19:27 | agent | kmsan-evaluator |
0mModel:best-expensive Args: null Results: {
"KMSANReasoning": "The patch modifies timeout handling for local RPC bind calls in the sunrpc subsystem. It introduces a static constant `rpcb_local_timeout` structure, adds timeout-related flags (`RPC_TASK_SOFT | RPC_TASK_TIMEOUT`) to `rpcb_register_call`, and adds logic to propagate `-ETIMEDOUT` errors in `svc_generic_rpcbind_set` and `svc_register`. These changes do not introduce any new allocations, do not expose kernel memory to user space, and do not involve uninitialized variables. Any potential bugs introduced by these changes (such as use-after-free or race conditions due to timeouts) would be caught by standard KASAN or LOCKDEP. There is no risk of uninitialized memory usage or info-leaks that would require KMSAN.",
"NeedsKMSAN": false
}Instruction: You are an expert Linux kernel security engineer specializing in kernel memory
error detectors (KASAN and KMSAN). Your job is to review the provided patch series and
determine if the code changes justify spawning a dedicated KMSAN (KernelMemorySanitizer)
fuzzing session in addition to standard KASAN fuzzing.
CRITICAL DISTINCTION BETWEEN KASAN AND KMSAN:
- Standard KASAN kernel builds (upstream-apparmor-kasan.config) already enable
a comprehensive suite of debugging tools and sanitizers, including KASAN
(out-of-bounds accesses, use-after-free, double free, invalid free), LOCKDEP
(locking bugs and deadlocks), UB-sanitizers, and memory corruption checks.
- KMSAN (KernelMemorySanitizer) detects reads of UNINITIALIZED memory (stack, heap,
or page allocations) and kernel-to-user memory info-leaks.
Rule: THERE IS NO SENSE IN RUNNING A KMSAN SESSION IF A BUG CAN BE CAUGHT BY KASAN,
LOCKDEP, OR OTHER STANDARD BUG DETECTORS.
A dedicated KMSAN fuzzing session incurs significant resource costs. You must ONLY
set NeedsKMSAN=true if the code changes introduce or expose UNINITIALIZED MEMORY risks
that are detected ONLY by KMSAN.
Look holistically at the patch series and surrounding code. Even if no direct
uninitialized field accesses or new buffer allocations are added in the diff itself,
a patch may alter control flow, bounds checking, or data length calculations in ways
that change how the rest of the code operates on existing buffers (e.g. allowing
uninitialized stack/heap memory to be read, copied to user space, or used in control
flow). Do not hesitate to use your code access tools to inspect the surrounding code,
called functions, and callers.
Set NeedsKMSAN=true ONLY IF the patch introduces or modifies:
1. Kernel structures sent to user space (via copy_to_user, put_user, netlink skb
attributes, ioctl output arguments, socket options, or BPF buffers) where fields
or structure padding might not be fully initialized/zeroed.
2. Conditional logic or branching that depends on potentially uninitialized variables
or struct fields.
3. Allocation or initialization of complex data structures where uninitialized fields
could be read later in reachable code paths.
4. Bounds checks, lengths, or logic in a way that allows surrounding code to access
uninitialized bytes of existing buffers.
Set NeedsKMSAN=false IF:
- The code changes primarily risk out-of-bounds access, array overflows, NULL pointer
dereferences, locking deadlocks, or use-after-free bugs (these are already caught
by KASAN, LOCKDEP, or standard bug detectors).
- All stack/heap structures touched or introduced by the patch are fully zeroed
or initialized (e.g. using = {0}, memset, kzalloc) before being read or copied.
- The patch does not introduce any risk of uninitialized memory usage or info-leaks.
Use your code access tools to inspect the surrounding code if necessary, then provide
detailed KMSANReasoning contrasting KASAN vs KMSAN applicability for this patch.
Prefer calling several tools at the same time to save round-trips.
Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.
Prompt: For your convenience, here is the diff of the changes:
commit 59b6884cf519c0411a02d7f6d9a08f0d7e810688
Author: syz-cluster <triage@syzkaller.com>
Date: Fri Aug 7 19:23:59 2026 +0000
syz-cluster: applied patch under review
diff --git a/net/sunrpc/rpcb_clnt.c b/net/sunrpc/rpcb_clnt.c
index 6aa372188c86a..4094f3257876d 100644
--- a/net/sunrpc/rpcb_clnt.c
+++ b/net/sunrpc/rpcb_clnt.c
@@ -221,6 +221,12 @@ static void rpcb_set_local(struct net *net, struct rpc_clnt *clnt,
# define SUN_LEN(ptr) (offsetof(struct sockaddr_un, sun_path) \
+ 1 + strlen((ptr)->sun_path + 1))
+static const struct rpc_timeout rpcb_local_timeout = {
+ .to_initval = (HZ / 10) ? : 1,
+ .to_maxval = (HZ / 10) ? : 1,
+ .to_retries = 0,
+};
+
/*
* Returns zero on success, otherwise a negative errno value
* is returned.
@@ -238,6 +244,7 @@ static int rpcb_create_af_local(struct net *net,
.version = RPCBVERS_2,
.authflavor = RPC_AUTH_NULL,
.cred = current_cred(),
+ .timeout = &rpcb_local_timeout,
/*
* We turn off the idle timeout to prevent the kernel
* from automatically disconnecting the socket.
@@ -312,6 +319,7 @@ static int rpcb_create_local_net(struct net *net)
.version = RPCBVERS_2,
.authflavor = RPC_AUTH_UNIX,
.cred = current_cred(),
+ .timeout = &rpcb_local_timeout,
.flags = RPC_CLNT_CREATE_NOPING,
};
struct rpc_clnt *clnt, *clnt4;
@@ -402,11 +410,11 @@ static struct rpc_clnt *rpcb_create(struct net *net, const char *nodename,
static int rpcb_register_call(struct sunrpc_net *sn, struct rpc_clnt *clnt, struct rpc_message *msg, bool is_set)
{
- int flags = RPC_TASK_NOCONNECT;
+ int flags = RPC_TASK_NOCONNECT | RPC_TASK_SOFT | RPC_TASK_TIMEOUT;
int error, result = 0;
if (is_set || !sn->rpcb_is_af_local)
- flags = RPC_TASK_SOFTCONN;
+ flags |= RPC_TASK_SOFTCONN;
msg->rpc_resp = &result;
error = rpc_call_sync(clnt, msg, flags);
diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
index ae9ec4bf34f72..539ddd06467df 100644
--- a/net/sunrpc/svc.c
+++ b/net/sunrpc/svc.c
@@ -1207,6 +1207,9 @@ int svc_generic_rpcbind_set(struct net *net,
error = svc_rpcbind_set_version(net, progp, version,
family, proto, port);
+ if (error == -ETIMEDOUT)
+ return error;
+
return (vers->vs_rpcb_optnl) ? 0 : error;
}
EXPORT_SYMBOL_GPL(svc_generic_rpcbind_set);
@@ -1243,6 +1246,8 @@ int svc_register(const struct svc_serv *serv, struct net *net,
printk(KERN_WARNING "svc: failed to register "
"%sv%u RPC service (errno %d).\n",
progp->pg_name, i, -error);
+ if (error == -ETIMEDOUT)
+ return error;
break;
}
}
|
| 49/3 | 2026/08/07 19:27 | llm | kmsan-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 2839 output: 193 thoughts: 726 Thoughts: **My Assessment of the SunRPC Timeout Patch** Okay, so I've just reviewed this patch. It looks like we're tightening up timeout handling within the SunRPC subsystem, specifically focusing on the `rpcb` client and server components. The changes are concentrated in `net/sunrpc/rpcb_clnt.c` and `net/sunrpc/svc.c`. My initial thought is that this is a relatively straightforward modification. We're introducing a `rpcb_local_timeout` structure and using it to configure timeouts when creating local RPC bind connections. The `rpcb_local_timeout` itself appears to be a fully initialized, `static const` structure, so that's good – no risk of uninitialized memory there. I'll double-check it. Yep, it's defined and initialized as expected. The core of the patch seems to revolve around setting and propagating timeout flags. Specifically, `rpcb_register_call` is being updated to include `RPC_TASK_SOFT | RPC_TASK_TIMEOUT` in the flags. This is then combined with other flags such as `RPC_TASK_SOFTCONN` if appropriate, so that seems sensible. On the server side, `svc_generic_rpcbind_set` and `svc_register` are modified to explicitly return `-ETIMEDOUT` if that error code is encountered. This makes it a bit more explicit, allowing the upper layers to correctly handle the timeout. I've carefully considered the potential security implications, and I don't see any immediate red flags. There's no introduction of new, uninitialized memory usage, no exposure of internal data structures to user space, and no complex data allocation patterns that could lead to memory corruption vulnerabilities. This is important to note since my goal is to ensure this patch is as secure as possible. The timeout is fully initialized and should work well in the RPC context. The error code of the `svc_generic_rpcbind_set` and `svc_register` were correctly handled and passed further up the chain. Considering the nature of the changes, I'm confident that KASAN and other standard kernel bug detectors (like KMSAN) will be sufficient to catch any subtle issues, such as use-after-free conditions that might arise from buggy timeout handling. Based on this analysis, I'm comfortable setting `NeedsKMSAN=false` for this patch. I don't believe any KMSAN-specific checks are required. |
| 50/3 | 2026/08/07 19:27 | tool | set-results |
0mArgs:{
"KMSANReasoning": "The patch modifies timeout handling for local RPC bind calls in the sunrpc subsystem. It introduces a static constant `rpcb_local_timeout` structure, adds timeout-related flags (`RPC_TASK_SOFT | RPC_TASK_TIMEOUT`) to `rpcb_register_call`, and adds logic to propagate `-ETIMEDOUT` errors in `svc_generic_rpcbind_set` and `svc_register`. These changes do not introduce any new allocations, do not expose kernel memory to user space, and do not involve uninitialized variables. Any potential bugs introduced by these changes (such as use-after-free or race conditions due to timeouts) would be caught by standard KASAN or LOCKDEP. There is no risk of uninitialized memory usage or info-leaks that would require KMSAN.",
"NeedsKMSAN": false
}Results: {
"KMSANReasoning": "The patch modifies timeout handling for local RPC bind calls in the sunrpc subsystem. It introduces a static constant `rpcb_local_timeout` structure, adds timeout-related flags (`RPC_TASK_SOFT | RPC_TASK_TIMEOUT`) to `rpcb_register_call`, and adds logic to propagate `-ETIMEDOUT` errors in `svc_generic_rpcbind_set` and `svc_register`. These changes do not introduce any new allocations, do not expose kernel memory to user space, and do not involve uninitialized variables. Any potential bugs introduced by these changes (such as use-after-free or race conditions due to timeouts) would be caught by standard KASAN or LOCKDEP. There is no risk of uninitialized memory usage or info-leaks that would require KMSAN.",
"NeedsKMSAN": false
} |
| Total Calls | Total Tokens | Avg Tokens | Total Duration (Seconds) | Avg Duration (Seconds) |
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| Total Calls | Total Duration (Seconds) | Avg Duration (Seconds) |
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